649781426 has 16 divisors (see below), whose sum is σ = 1120353984. Its totient is φ = 276867024.

The previous prime is 649781417. The next prime is 649781449. The reversal of 649781426 is 624187946.

649781426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131720 + ... + 136563.

It is an arithmetic number, because the mean of its divisors is an integer number (70022124).

Almost surely, 2^649781426 is an apocalyptic number.

649781426 is a deficient number, since it is larger than the sum of its proper divisors (470572558).

649781426 is a wasteful number, since it uses less digits than its factorization.

649781426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268465.

The product of its digits is 580608, while the sum is 47.

The square root of 649781426 is about 25490.8106187308. The cubic root of 649781426 is about 866.1419983805.

The spelling of 649781426 in words is "six hundred forty-nine million, seven hundred eighty-one thousand, four hundred twenty-six".